MPD Operating Manual
21
Figure 11. MPD with Flow Adaptor
NOTe
The Gas Calibration menu is for both Zero and Span Calibration.
3. Connect the Flow Adaptor (using either gas pipe) to the regulated cylinder
containing a known concentration of the target gas at approximately the
sensor alarm point (e.g. 50% LEL Methane in air).
WARNING
As some test gases may be hazardous, the Flow Adaptor outlet should exhaust
into a safe area.
4. Follow the procedure in Section 3.2.1 of XNX Universal Transmitter Technical
Manual for both Zero and Span calibrations.
5. Apply the target gas to the sensor. Pass the gas through the Flow Adaptor
at a rate of 0.5l/m ± 0.2l/m.
NOTe:
Sensors should be calibrated at concentrations representative of those to
be measured. It is always recommended that the sensor is calibrated with
the target gas it is to detect.
CAUTION
Where the user calibrates any sensor using a different gas, responsibility for
identifying and recording calibration rests with the user. Refer to the local
regulations where appropriate.
6. Ensure that the sensor and the vicinity around it are clear all traces of
the calibration gas before continuing. This is to avoid triggering spurious
alarms. If calibration fails at any point discard the cartridge and replace
with a new one.
7. Remove the test equipment, ret the weatherproof cap to the sensor (if
previously removed for the test) and return the system to normal operation.
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